Three supplications will not be rejected (by Allah (Subhanahu wa Ta’ala)), the supplication of the parent for his child, the supplication of the o­ne who is fasting, and the supplication of the traveler. – [al-Bayhaqi, at-Tirmidhi – Sahih]
Narrated Abu Huraira (Radi-Allahu ‘anhu): Abu-l-Qasim (the Prophet) (ﷺ) said:

“On Friday there is a particular time if a Muslim happens to be praying and invoking Allah for something good during that time, Allah will surely fulfill his request.” The Prophet (Sallallahu ‘Alaihi Wa Sallam) pointed out with his hand. We thought that he wanted to illustrate how short that time was. – [Bukhari Vol. 8 : No. 409]

The hadeeth of Jabir ibn ‘Abdillah (may Allah be pleased with him) who said: The Messenger of Allah (ﷺ) said:

“The day of Friday has twelve hours, in which there is no Muslim slave who asks Allah for anything but He will grant it to him, so seek it in the last hour after ‘Asr.” – [Abu Dawood and an-Nasai]

The Prophet (ﷺ) said:

“Indeed the fasting person has at the time of breaking fast a prayer (supplication) which is not rejected.” – [Ibn Majah and Al-Hakim]

“من فطّر صائماً؛ كان له مثل أجره، غير أنَّه لا ينقص من أجر الصائم شيء”.
‘Whoever opened the fast of a fasting person then he will receive the reward the like of the fasting person, except that it will not decrease anything from the reward of the fasting person.’
[Collected by Tirmidhi, Nisa’ee, Ibn Majah, Ibn Khuzaimah and Ibn Hibban & Albaani graded it Saheeh in Saheeh Targheeb no.1078]
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